Browsing NTNU Open by Author "Børvik, Tore"
Now showing items 1-20 of 196
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A Combined Precipitation, Yield Stress, and Work Hardening Model for Al-Mg-Si Alloys Incorporating the Effects of Strain Rate and Temperature
Myhr, Ole Runar; Hopperstad, Odd Sture; Børvik, Tore (Journal article; Peer reviewed, 2018)In this study, a combined precipitation, yield strength, and work hardening model for Al-Mg-Si alloys known as NaMo has been further developed to include the effects of strain rate and temperature on the resulting stress–strain ... -
A Lode-dependent Gurson model motivated by unit cell analyses
Dæhli, Lars Edvard; Morin, David; Børvik, Tore; Hopperstad, Odd Sture (Journal article; Peer reviewed, 2017)In this study, the effects of including a dependency on the third deviatoric stress invariant in the void evolution equation of the Gurson model are examined using unit cell calculations and imperfection band analyses. ... -
A Multi-Scale Approach for Modelling of Fracture in Aluminium Alloys under Impact Loading
Valle, Heidi; Frodal, Bjørn Håkon (Master thesis, 2015)The main objective of this thesis was to investigate the ballistic properties of an isotropic AlMgSi aluminium alloy both experimentally and numerically. Uncoupled and coupled fracture models were calibrated using ... -
A nano-scale material model applied in finite element analysis of aluminium plates under impact loading
Johnsen, Joakim; Holmen, Jens Kristian; Myhr, Ole Runar; Hopperstad, Odd Sture; Børvik, Tore (Journal article, 2013)Finite element simulations of AA6070 aluminium plates struck by ogival-nose projectiles are performed. The aluminium plates are 20 mm thick and heat treated to temper O, T4, T6 and T7. A nano-scale material model, consisting ... -
A numerical study on the deformation and fracture modes of steel projectiles during Taylor bar impact tests
Rakvåg, Kristian Gaarder; Børvik, Tore; Hopperstad, Odd Sture (Journal article; Peer reviewed, 2014)A heterogeneous material model based on macro-mechanical observations is proposed for simulation of fracture in steel projectiles during impact. A previous experimental study on the deformation and fracture of steel ... -
A physically-based constitutive model applied to AA6082 aluminium alloy at large strains, high strain rates and elevated temperatures
Vilamosa, Vincent; Clausen, Arild Holm; Børvik, Tore; Holmedal, Bjørn; Hopperstad, Odd Sture (Journal article; Peer reviewed, 2016)This paper presents a physically-based constitutive model applied to an AA6082 aluminium alloy subjected to large strains, high strain rates and elevated temperatures. The model accounts for thermo-elasticity, thermo-vis ... -
A shock tube facility to generate blast loading on structures
Aune, Vegard; Fagerholt, Egil; Langseth, Magnus; Børvik, Tore (Journal article; Peer reviewed, 2016)This study evaluates the performance of a new shock tube facility used to produce blast loading in controlled laboratory environments. The facility was found to generate a planar shock wave over the tube cross section by ... -
A Shock Tube Used to Study the Dynamic Response of Blast-Loaded Plates
Aune, Vegard; Casadei, Folco; Valsamos, Georgios; Langseth, Magnus; Børvik, Tore (Journal article; Peer reviewed, 2018)This study aims to a better understanding of the performance of a shock tube used to produce blast loading in controlled laboratory environments. Special focus is placed on the influence of the diaphragm failure process ... -
A study of the influence of precipitate free zones on the strain localization and failure of the aluminium alloy AA7075-T651
Fourmeau, Marion; Marioara, Calin Daniel; Børvik, Tore; Benallal, Ahmed; Hopperstad, Odd Sture (Journal article; Peer reviewed, 2015)Age-hardened aluminium alloys have various degrees of precipitate-free zones (PFZs) along grain boundaries (GBs). The PFZs are weak zones and their existence promotes combined transgranular and intergranular fracture, thus ... -
A through-thickness damage regularisation scheme for shell elements subjected to severe bending and membrane deformations
Costas Pino, Miguel; Morin, David; Hopperstad, Odd Sture; Børvik, Tore; Langseth, Magnus (Journal article; Peer reviewed, 2018)This research work proposes and validates a damage regularisation model for shell elements used in large-scale simulations. The model evaluates the ratio of bending to membrane loading in the elements based on the ... -
Aluminium plates with pre-formed slits subjected to blast loading
Granum, Henrik; Aune, Vegard; Børvik, Tore; Hopperstad, Odd Sture (Chapter, 2018)The dynamic response of thin, perforated aluminium plates subjected to blast loading was studied both experimentally and numerically. Two different blast intensities were used and the plates were pre-cut with four horizontal ... -
Aluminum structures exposed to blast loading
Hustad, Tore Andre; Lindland, Andreas Lyngtveit (Master thesis, 2014)Design of blast resistance in structures is an important aspect in modern society. Plated structures are used in a lot of constructions that can be especially vulnerable to explosions. This includes e.g. protective, offshore ... -
An experimental study on the deformation and fracture modes of steel projectiles during impact
Rakvåg, Knut Gaarder; Børvik, Tore; Westermann, Ida; Hopperstad, Odd Sture (Journal article, 2013)Previous investigations of the penetration and perforation of high-strength steel plates struck by hardened steel projectiles have shown that under certain test conditions the projectile may fracture or even fragment upon ... -
An experimental-numerical method to determine the work-hardening of anisotropic ductile materials at large strains
Khadyko, Mikhail; Dumoulin, Stephane; Børvik, Tore; Hopperstad, Odd Sture (Journal article; Peer reviewed, 2014)The determination of work-hardening for ductile materials at large strains is difficult to perform in the framework of usual tensile tests because of the geometrical instability and necking in the specimen at relatively ... -
Anisotropic failure modes of high-strength aluminium alloy under various stress states
Fourmeau, Marion; Børvik, Tore; Benallal, A; Hopperstad, Odd Sture (Journal article; Peer reviewed, 2013)The influence of stress state and plastic anisotropy on the fracture behaviour of a rolled AA7075-T651 aluminium plate under quasi-static loading conditions is studied both experimentally and numerically. Material tests ... -
Anisotropic Plasticity and Fracture of Three 6000-Series Aluminum Alloys
Thomesen, Susanne; Hopperstad, Odd Sture; Børvik, Tore (Peer reviewed; Journal article, 2021)The influence of microstructure on plasticity and fracture of three 6000-series aluminum alloys is studied with emphasis on the anisotropy caused by the extrusion process. Tension tests on smooth and notched specimens are ... -
Anisotropic tensile failure of metals by the strain localization theory: An application to a high-strength aluminium alloy
Morin, David; Fourmeau, Marion; Børvik, Tore; Benallal, Ahmed; Hopperstad, Odd Sture (Journal article; Peer reviewed, 2018)This paper investigates the influence of plastic anisotropy on the tensile ductility of a high-strength aluminium alloy. To this end, finite element simulations of smooth and notched tension tests in different material ... -
Aspects of fluid-structure interaction on the dynamic response of blast-loaded metallic plates
Aune, Vegard; Valsamos, Georgios; Casadei, Folco; Børvik, Tore (Chapter, 2019)This work presents results from an experimental and numerical investigation on the influence of fluid-structure interaction (FSI) on the dynamic response of thin steel plates subjected to blast loading. The loading was ... -
Ballistic impact of layered and case-hardened steel plates
Holmen, Jens Kristian; Solberg, Jan Ketil; Hopperstad, Odd Sture; Børvik, Tore (Journal article; Peer reviewed, 2017)We investigated the ballistic resistance of hot-rolled structural steel plates with a nominal yield stress of 355 MPa in this study. Ballistic tests were conducted with 7.62mm armor piercing bullets on monolithic and ... -
Ballistic impact of structural steels at low temperatures
Holmen, Jens Kristian; Thomesen, Susanne; Perez-Martin, Maria Jesus; Hopperstad, Odd Sture; Børvik, Tore (Peer reviewed; Journal article, 2022)Steels are usually stronger at low temperatures than at high temperatures. But low temperatures are, particularly in combination with high strain rates and high stress triaxiality ratios, known to cause embrittlement. The ...